Crosman Front Globe Sight Ring For 2240 2250 2260 2289 & Others This is a steel globe sight ring for the standard plastic Crosman front sight that ships on the 2240 and other current guns. It will fit any 7/16" OD barrel that has the flat notch on the muzzle... those barrels are found on the 2240, 2250, 2260, 2289, etc. The ring slides onto the sight via two otherwise unnoticed grooves on the sight itself. You can buy just the ring itself or the ring and sight combined. One ring (or ring + sight) per purchase.